oap_labs/MainWindow.xaml.cs

using System.ComponentModel;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using exam.Model;

namespace exam
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        private IEnumerable<Clothes> _clothes = null;
        public List <ClothesCategory> ClothesCategoriesList { get; set; }
        public string selectedCategory = "";
        public IEnumerable<Clothes> ClothesList
        {
            get
            {
                return _clothes
                    .Where(c => (selectedCategory == "Все категории" || c.Category == selectedCategory));
            }
            set 
            {
                _clothes = value;
            }
        }
        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
            Globals.dataProvider = new JsonDataProvider();
            ClothesList = Globals.dataProvider.GetClothes();
            ClothesCategoriesList = Globals.dataProvider.GetClothesCategories().ToList();
            ClothesCategoriesList.Insert(0, new ClothesCategory { Title = "Все категории" }); 
            
        }

        private void ExitButton_Click(object sender, RoutedEventArgs e)
        {
            Application.Current.Shutdown();
        }

        private void CategoryFilterComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            selectedCategory = (CategoryFilterComboBox.SelectedItem as ClothesCategory).Title;
            Invalidate();
        }
        public event PropertyChangedEventHandler PropertyChanged;
        private void Invalidate()
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("ClothesList"));
        }
    }
}